Transportable grinding machine



March 31, 1931. w R|NAU 1,798,224

TRANS PORTABLE GRINDING MACHINE Filed May 3, 1929 Patented Mar. 31, 1931UNITED STATES WILHELM RINAU, OF BREMEN, GERMANY TRANSPORTABLE GRINDINGMACHINE Application filed May 3, 1929, Serial No. 360,153, and inGermany February 18, 1928.

Grinding machines, in which the common carrier for the grinding spindleand the motor are balanced by a heavy mass and ad justable in verticaldirection, and in which the grinding spindle is oscillatable aroundhorizontal and vertical axes in being simultaneously transportable andadapted to be adjusted in vertical direction, have become known. Thisinvention has for its object to improve the applicability of suchgrinding machines and particularly to enlarge the radius of action ofthe grinding wheel without shifting of the transportable frame.

The usual construction of the grinding spindle presents theinconvenience of insecure guiding and considerable wear. The object ofthe invention, to enlarge the radius of action of the grinding wheelswithout shifting of the transportable frame, is atzo tained specially bya shifting of the grinding spindle in longitudinal direction with littleexpense of power and without submitting the elements to appreciablewear. According to the invention the grinding spindle, which in a mannerknown per se is rendered oscillatable by means of a universal joint, isoscillatably suspended on a bracket pivotally mounted at the side of thevertical guiding axle.

A further improvement consists in that on said vertical guiding axle aguiding sleeve is shiitably mounted adapted to be raised by a winch, thebearing bracket for the grinding spindle being pivotally mounted on alateral arm of said guide sleeve.

According to the invention the bearing bracket for the grinding spindleoscillatably mounted by means of a universal joint is pivotally mountedon the side of the vertical guiding axle facing the grinding spindle,said bracket being further fitted with an arouate slot for the verticalgrinding axle.

Various embodiments of the invention are possible, and one of theseembodiments is illustrated by way of example in the accompanying drawingin which:

Fig. 1 shows the grinding machine in elevation, partly in section,

Fig. 2 is a side elevation of Fig. l.

Fig. 3 is a top plan View of Fig. 2, partly in section on line 11-11 ofthis figure.

On the vertical guiding axle a of the frame 2'), mounted on wheels, abearing sleeve 0 is shiftably guided, which is adapted to be se cured inits adjusted position by means of a set screw cl. The bearing sleeve 0carries a bracket 0 on one side of which a winch 7 adapted to beoperated by a crank handle 9 is mounted. This winch f has ratchet teeth2'. The rope h of the winch f is guided over a pulley 70 mounted on thetop end of the axle a, and it is attached at Z to the bracket 6. Thebearing sleeve 8 has a laterally projecting arm 0, on a bearing 0 ofwhich a bearing bracket a is pivotally mounted by means of an axle m. Anarm a of said bearing bracket, projecting on the other side of the axlea, serves as carrier for the grinding spindle 0 which is oscillatablymounted by means of a universal joint 19 in a manner known per se. Thegrinding spindle 0, which carries at its front end the grinding wheel q,may be directly driven from a motor 7- fixed on the machine. WVith thisobject in view the grinding spindle may be mounted in a special housingoscillatable by means of a universal joint. The arm n of the bearingbracket n has an arcuate slot 8 so that the bearing bracket n and withthe same the grinding spindle 0 can 8 r be freely oscillated. By thisconstruction is obtained that the grinding spindle 0 can be oscillatedaround the vertical bolt p and also around the horizontal bolt p of theuniversal oint.

The grinding spindle 0 can be further shifted in horizontal direction byoscillating around the bolt m, shifting of the frame I) being notnecessary for this purpose.

The radius of action of the grinding wheel is thereby considerablyenlarged.

The grinding spindle 0 can be easily moved in all directions inaccordance with the shape of the blank to be treated and without muchexpense of power, when it is gripped in proximity of the grinding wheel.

For the arcuate slot 8 a slot open at one end can be substituted so thatit is possible to oscillate the grinding spindle approximately 360.

I claim 1. A transportable grinding machine comprising, in combination,a vertical guiding axle, a grinding spindle, a bearing bracket tor saidgrinding spindle, a universal joint connecting the grinding spindle withthe bearing bracket, a guide sleeve shiftably mounted on said guidingaxle, a Winch on said guide sleeve on one side of said guiding axle, 10an arm of said guide sleeve laterally projecting on the side of saidguiding axle opposite said bearing bracket, said bearing bracket beingpivotally mounted on said arm and having an arcuate slot engaging oversaid guiding axle.

2. A transportable grinding machine comprising, in combination, avertical guiding axle, a grinning spindle, a bearing bracket for saidgrinding spindle, a universal joint con- 2;) necting the grindingspindle with the bearing bracket, a guide sleeve shiftably mounted onsaid guiding axle, and arm projecting from said sleeve laterally on theside of the guiding axle opposite said bearing bracket, said 3 bearingbracket being pivotally mounted on said arm and having an arcuate slotengaging over said guiding axle.

In testimony whereof I aflix my signature.

XVILHELM RINAU.

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